Sandpaper and rubbing machine



April 12 1927.

L. FERRARA ANDPAPER AND RUBBING MACHINE Filed Dec. 11. 1925 2 Sheets-Sheet 1 INVENTOR ouis Warm/m L. FE RRARA SANDPAPER AND RUBBING MACHINE April 12, 1927-.

Filed Dec. '11 1925 2" Sheets-$11661. 2

J w m m H I .m w m 7 VW 0 w a 1 w H t an" -tion, and of the objects and advantages Patented Apr. '12, 1927. I 1,624,400 UNITED STATES P ATE'NT OFFICE.

LOUIS FERBARA, OF BROOKLYN, NEW YORK.

SANDPAPER AND RUBBING MACHINE.

Application flledneeember 11,1925. Serial No. 74,712.

This invention relates machines for use in sandpaper-ing floors, with the fulcrum point of the lever. automobile bodies. cabinet walls, or other lever surfaces, the invention having for an object arms l8 having revolvably supported at the the provision of a novel means of a machine extremities drums 22 over which are passed of this sort which is readily manipulable by the ends of a web 23 of sand paper, the web hand and in which the active operative eleof paper passing under the foot from one. ment is adjustable and in the form of a drum to the other and bearing against idler reciprocable device, and said reciprocable dedrums 50 revolvably supported by brackets \'iccbeing pivoted in the central portion of 51 carried by said foot 20. The paper is the casing. 7 locked to the foot by means of the clam ing For further comprehension of the invenbars 25 that project across the ends the foot and are fixed to the ends of the bars thereof,'reference will be had to the follow- 26 slidable in bearing elements 27 on the ing description and accompanying drawfoot, springs 28 acting to keep the clamping ings, and to the appended claims in which bars in operative'position. The inner ends the various novel features of the invention of the bars 26 bear against a cam 31 that are more particularly set forth. v is fixed on the rod. 32 that extends along Fig; 1 of the drawings, shows a side elelever 18- and "is pivotally mounted thereon. vation of my improved device. Tl 's rod 32 has fixed thereto a laterally Fig. 2 shows a side view thereof, partly to improvements in and Whose lower surface is curved concentric Said sectional taken on the line 2,-2 of F iguye in a slot 52 of cover plate 19. and length of 30 said Figure .4.

ure 4.

handle 11 is attached.

* casing. The face of the gear 14 is provided Fig. 3 shows a transverse, fragmentary said slot may be varied by shifting slot sectional view taken on the line{3 3 of plates 53 slidably mounted to cover plate Figure 1. 19 and fixed in position by wing screws 54,

Fig. 4 shows a side elevational view of a whereby when the lever reaches the end of slightly modified form of my invention. its oscillatory movement, the rod 32 is F ig. 5 shows a side view of Figure 4, recited by pin 34 striking edge of adjusted partly sectional taken on the line 5-5 of slot 52, and so momentarily frees the clamping bars from the paper to permit of the latter'bcing advanced. Fixed to the rod 32 at the upper portion is an arm 40 connected to further extension 40, and engaging one end of the lever 41 pivoted to one of saiddrums 22 and other end operating a ratchet 42 that bears against ratchet wheel 43 fixed c'o-axially to the latter said drum 22. The

In the drawing the reference numeral pin-34 and arm 40 are so positioned with indicates a small electric motor of ordinary respect to one another and the action of cam type to the casing of which a projecting 31 that the clamping bars 25 will be lifted Upon one end of the from the paper before the thrust moves the shaft 12 of the motor a gear pinion 13 is fixed, this pinion meshing with/a gear 14 again engaging the paper after the said loose on a stub shaft 15 fixed in the motor movement of the drum has been completed. The modified form of my invention shows with a projecting portion 14 having a a slightly different construction and arseries of apertures 14 each differently posil'ange e of parts. The casing cover 19 tioned relativeto the shaft 15, and a pin 16 similarly has a central projection 19, but is adapted to be forced into any of said the gear 14 is situated on the vertical center apertures, thereby providing an adjustable lineabove the shaft 12, necessitating the use eccentricity for said pin, which engages in a of a different oscillating lever 18 having longitudinal slot 17 in an oscillatory lever the actuating slot 17 on the upper end. In-

Fig. 6 shows a fragmentary tranversesectional view taken" onthe'line 66 of Figure 4. I Fig. 7 shows a fragmentary transverse sectional view taken on the line 7-7 of Fig- Fig. 8 shows a face view of part 14:

18 that is 'fulcrumed to a projection 19 stead of two springs 28, four springs 28' are from the center of easing cover 19.

used acting together with standards 27' fixed to foot 20. The ad'ustment of the Upon the lower end of the lever 18 is fixed ed by adjusting a foot of rectangular shape in plan view length of slot 52 is contro 18 is provided with lever extension.

' drum and advances the paper, the bars 25 screws 60 acting through tapped holes in cover 19.

The operation and use of my machine will be readily understood from the above descrlption, itbeing a parent that rotation of the motor shaft wil cause the foot 20 to oscillate and the paper to be gradually fed forward. The pin 34 in the bar 18 striking the right hand side of slot 52 turns said bar 18 to the left causing the ratchet wheel to advance the sandpaper, and as previously explained also causes with correct turning to release 25 while when said pin strikes the left-hand side of slot 52 it causes bar 18 to turn to the right thereby idling pawl backward on ratchet wheel, but not turning the wheel therefore not moving the sandpaper even. though clamping bars releases paper as before explained.

While I have above described the preferred form, construction and arrangement of the several elements employed, it will be understood that the device is nevertheless, susceptible of considerable modification therein, and I therefore reserve the privilege of resorting to all such changes as may be fairly embodied within the spirit and scope of the invention as claimed.

Having thus described my invention, what I claim as new, and desire to protect by Letters Patent of the United States is as follows 1. A sandpapering machine comprising an electric motor, a casing for said motor, a lever fulcrumed on the motor casing at the central part thereof, means Within the casing forming an operative connection between the motor shaft and the lever to oscillate the lever, a sandpaper holding foot rigidly mounted on said lever, a pair of drums supported by said lever, a strip of sandpaper extending from said drums across the face of said holding foot, means for clamping said sandpaper, and means for releasing said clamping means and advancing said sandpaper.

2. A sandpapering machine comprising an electric motor, a casing for said motor, a lever fulcrumed on the motor casing at the central part thereof, means within the easlng forming an operative connection between the motor shaft and the lever to oscillate the lever, said means comprising an elongated slot in the lever, a train of gears connected with said motor shaft, one gear of said train being formed with a projectin ortion having a series of apertures each dih'erently positioned relative to the center of rotation of said gear, and a pin engaged in one of said apertures, said pin projectin into said elongated slot, at sandpaper holding foot rigidly mounted on said lever, a pair of drums supported by said lever, a strip of sandpaper extending from said drums it across the face of said holding foot, means for clamping said sandpaper, and means for releasing said clamping means and advancing said sandpaper.

3. A sandpapering machine comprising an electric motor, a casing for said motor, a lever fulcrumed on the motor casing at the central part thereof, means within the casing forming an operative connection between the motor shaft and the lever to oscillate the lever, said means comprising an elongated slot in the lever, a train of gears connected with said motor. shaft, one gear of said train being formed with a pro]ecting portion having 2i series of apertures each differently positioned relative to the center of rotation of said gear, and a pin engaged in one of said apertures, said pin projecting into said elongated slot, a sandpaper holding foot rigidly mounted on said lever, a pair of drums supported by said lever, a strip of sandpaper extending from said drums across the face of said holding foot, means for clamping said sandpaper, an arcuate slot in said casing, adjustable means at each end of the arcuate slot for the efiective length of said arcuate slot, and means for momentarily freeing and advancing the sandpaper, controlled by a member striking the adjustable means at the ends of said arcuate slot.

In testimony whereof I have atli'xed my signature.

LOUIS FERRARA. 

